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1 /***
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2 * ASM: a very small and fast Java bytecode manipulation framework
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3 * Copyright (c) 2000-2005 INRIA, France Telecom
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4 * All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions
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8 * are met:
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 * 2. Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 * 3. Neither the name of the copyright holders nor the names of its
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15 * contributors may be used to endorse or promote products derived from
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16 * this software without specific prior written permission.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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28 * THE POSSIBILITY OF SUCH DAMAGE.
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29 */
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30 package clojure.asm;
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31
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32 /**
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33 * An edge in the control flow graph of a method body. See {@link Label Label}.
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34 *
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35 * @author Eric Bruneton
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36 */
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37 class Edge{
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38
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39 /**
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40 * Denotes a normal control flow graph edge.
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41 */
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42 final static int NORMAL = 0;
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43
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44 /**
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45 * Denotes a control flow graph edge corresponding to an exception handler.
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46 * More precisely any {@link Edge} whose {@link #info} is strictly positive
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47 * corresponds to an exception handler. The actual value of {@link #info} is
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48 * the index, in the {@link ClassWriter} type table, of the exception that
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49 * is catched.
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50 */
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51 final static int EXCEPTION = 0x7FFFFFFF;
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52
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53 /**
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54 * Information about this control flow graph edge. If
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55 * {@link ClassWriter#COMPUTE_MAXS} is used this field is the (relative)
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56 * stack size in the basic block from which this edge originates. This size
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57 * is equal to the stack size at the "jump" instruction to which this edge
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58 * corresponds, relatively to the stack size at the beginning of the
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59 * originating basic block. If {@link ClassWriter#COMPUTE_FRAMES} is used,
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60 * this field is the kind of this control flow graph edge (i.e. NORMAL or
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61 * EXCEPTION).
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62 */
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63 int info;
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64
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65 /**
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66 * The successor block of the basic block from which this edge originates.
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67 */
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68 Label successor;
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69
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70 /**
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71 * The next edge in the list of successors of the originating basic block.
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72 * See {@link Label#successors successors}.
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73 */
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74 Edge next;
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75 }
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